The toll rose today as authorities confirmed more deaths in an announcement on Twitter.
The six children who died in the provinces of Yanbu, Ha'il and on the outskirts of the coastal city of Jiddah either drowned or were swept away by floodwaters.
Rainfall and strong winds also affected parts of the Islamic holy cities of Mecca and Medina, and the province of Tabuk.
For a third straight day this week, classes were suspended at schools and universities along some areas in Saudi Arabia's northwest.